Sons of Silence Motorcycle Club (SOSMC) is a one-percenter motorcycle club that was founded in Niwot, Colorado in the United States in 1966. The first chapter outside Colorado was the Iowa chapter which was founded in 1968. There are now American chapters in Arkansas, Florida, Illinois, Indiana, Kansas, Kentucky, Louisiana, Minnesota, Mississippi, Missouri, North Dakota, South Dakota, Tennessee, Utah and Wyoming. The first foreign chapter was founded in Munich, Germany in 1998. In 2001, more German chapters were founded in Freising, Gangkofen and Nürnberg. In November 2007, a Viernheim chapter was founded.
The Sons of Silence's logo is an American eagle superimposed over the letter "A" (similar to, and taken from, the Anheuser-Busch logo) flying under an arch and their motto is "donec mors non separat ", Latin for "until death separates us". The logo is embroidered onto the back of all members' jackets or vests.